Patents by Inventor J. Steven Flannigan

J. Steven Flannigan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4172990
    Abstract: A control system moves an inductively controlled multi-phase motor in a forward or reverse direction. The motion may be in steps or it may be a continuous rotation. A microprocessor under the control of a ROM operates through an integrated input/out device to provide control signals for the motor.In the step mode of operation, a high current level is induced in the next motor phase so as to accelerate the motor toward the next detent position. After the motor has traversed a predetermined percentage of the distance to the next detent position, as indicated by a sensor, a high current level is induced in the lagging phase of the motor so as to provide a decelerating torque. After a predetermined time, the high current is switched from the lagging to the leading phase to cause the motor to reach the next detent position, after which the current in the new detent phase is reduced to a holding level.
    Type: Grant
    Filed: April 8, 1976
    Date of Patent: October 30, 1979
    Assignee: Texas Instruments Incorporated
    Inventors: Mickey H. Everett, J. Steven Flannigan